A tractor safety interlock circuit allows engine starting only when both clutch and neutral switches are active. Which logic gate is most suitable for this operation? (Assume active switch means logic HIGH)
AND gate
A safety interlock is a logic circuit that permits an action only when a set of conditions is satisfied at the same time, protecting the operator and the machine.
Here the engine may start only when both the clutch switch and the neutral switch are active, and an active switch is treated as logic HIGH.
So the required behaviour is: the start-enable output is HIGH only when input A (clutch) is HIGH AND input B (neutral) is HIGH; any other combination must give LOW.
This 'output true only when all inputs are true' rule is precisely the truth table of an AND gate, making it the correct choice for the interlock.
An OR gate (option 2) would enable starting when either switch alone is active, defeating the safety purpose because the tractor could start in gear.
An XOR gate (option 3) actually goes LOW when both inputs are HIGH, the exact opposite of what is wanted, and a NOT gate (option 1) has only a single input and cannot combine two conditions at all.
Hence, the answer is AND gate.
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